The DIN chart is only SO accurate and does not address all people all the time only a generalization.
CHECK THEM YOURSELF Set you binding by what the chart says or what you've always used and THEN DO THIS.
Get in a boot (strong leg) buckle up, put ski on carpet in live room, have partner stand on tail. With you knee bent (always have a flexed bent knee/leg) go forward as hard as about 75/80%. You should release with some force not too easy and not too hard. Adjust binding accordinly in small increment (not over half a DIN #). Different binding will react in different ways, some will be harder and some easier (partially belying the DIN bible) and adjust release accordingly.
Have your partner stand on the front of the ski, flex and bend your foot/ankle/leg to the inside (for sideways release) you should be able to get out but with a considerable amount of twisting force. If you release too easy, adjust, if you can't get out have your partner easily tap the boot with his/her fist and see if you then release while pressuring ski. If so back off the screw about 1/4 turn and then see if you can get out without the tap from your partner.
Remember all bindings and boots should be clean and lubricated for this test.
A DIN chart alone doesn't accurately give a DIN for all people. It is only a guide and;/or recommendation. GOTTA START SOMEWHERE
In reading all the above comments it was suprising to see all the falls from people losing their skis. Yes I am an advocate of " I would rather lose a ski than a leg-knee " but there is a happy medium and it suprises me that someone would lose their skis all the time and fall. Hey where I ski that can mean some really BAD falls, injury type falls. I have lost one ski this year and it was not a premature release but one that should have happened. While skiing the trees I hit a hole with my right ski and it blew off from the impact - good release. Hey Bears don't let yourself get injured with releases that shouldn't happen.
I am 184ils level III skiers (but I am 68 yr) DIN says light release. I have my DIN at 8 which is what I have used for some odd 20 yrs, except for my last bindings on my S7s Rossi Pro's and moved down to 7 1/2 but has the same force releasing as my other bindings at 8. CHECK THEM YOURSELF THEN YOU WILL REALLY KNOW WHERE YOU ARE